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Alarm function in windows

How to Set Alarms in Windows 10

Most of us don’t have old-fashioned clock radios at home or portable alarm clocks to take with us on the road. When you need to be woken up at a particular time, you can use your smartphone, but any Windows 10 device can also do the job. Windows 10 has a built-in alarm clock app, which you can set up using the following steps.

1. Type «alarm» into the Windows search box.

2. Click the «Alarms & Clock» icon.

3. Click the plug button to add a new alarm time. You can also select an existing alarm to edit it.

4. Set an alarm time. You can also set the alarm sound, snooze time, number of times the alarm repeats and the name of the alarm, but these are all optional settings.

5. Click the save button in the lower right corner of the window.

Note that, on most computers, the alarm screen will say that «Notifications will only show if the PC is awake.» So, for your alarm to go off, you will need to configure your computer NOT to go to sleep.

To stop your computer from sleeping:

1. Type «sleep» into the Windows search box

2. Click «Power and Sleep Settings»

3. Set Sleep time to «Never» under «when plugged in» and / or «on battery.» If you don’t let it sleep when you’re on battery, your computer could run out of juice.

how to use alarms in windows 10

How to use Alarms & Clock app

Dismissing or snoozing alarms

When an alarm goes off, you’ll hear a sound and see a notification that you can snooze or dismiss.

It appears even if the app is closed, sound is muted, or your PC is locked. You can even dismiss alarms from the lock screen without unlocking it. However, in most cases, alarms won’t sound if your PC is asleep, and never when it’s shut down.

Notes: Some newer laptops and tablets have a feature called InstantGo, which wakes up the device to sound an alarm even if the device is asleep. However, it must be plugged in to AC power to ensure that it will wake up.
If you don’t have InstantGo, when you add a new alarm you’ll see a warning that alarms only work when your PC is awake.
If sound is muted, you won’t hear the alarm, but you’ll still get a notification.

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New in Windows 10

Convert times to different time zones in World Clock
Pin a clock, timer or stopwatch to Start for quicker access
Record laps and splits with the stopwatch
Use the app in a smaller window on the desktop
Use alarms even when the screen is locked or sound is muted, and choose different sounds for each alarm

how to use alarms in windows 10

World clocks

If you want to add a location and compare times from around the world:
1 – in the Alarms & Clock app, select World Clock, then New + at the bottom.
2 – insert the first few letters of the location you want, then select it from the drop-down list. If you don’t see the one you want, enter another location that’s in the same time zone.
3- select Convert times (the 2 clocks at the bottom), then move the slider to select a new time to compare. Select a location on the map to change which place the slider refers to.
4-to exit Convert Times mode, select the Back button, or press Esc.

how to use alarms in windows 10

IT-блоги • How to use SIGALARM and alarm function in C language?

Syntax

The function is defined in unistd.h header file.

Arguments

The function takes one argument, seconds. After seconds seconds have elapsed since requesting the alarm() function, the SIGALRM signal is generated. The default behavior on receipt of SIGALRM is to terminate the process. But, we can catch and handle the signal. (See signal handling)

The alarm() function will return a non zero value, if another alarm has been previously set and the value is the number of seconds remaining for the previous scheduled alarm due to delivered. Otherwise alarm() will return zero.

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Example1.c:

#include
#include
#include

void sig_handler ( int signum ) <

printf ( «Inside handler function \n » ) ;
>

signal ( SIGALRM , sig_handler ) ; // Register signal handler

alarm ( 2 ) ; // Scheduled alarm after 2 seconds

for ( int i = 1 ;; i ++ ) <

printf ( «%d : Inside main function \n » , i ) ;
sleep ( 1 ) ; // Delay for 1 second
>
return 0 ;
>

In the screenshot of the output of Example1.c, the program is run using time command, so that we can get an overview of the execution time of the program. We observed that in main function we call alarm() function, scheduled for 2 seconds. So, for loop is executing, after 2 seconds sig_handler function is called and the execution of main function is paused. After execution of sig_handler function, in main function for loop execution is resumed. Here we use sleep function for delaying so that we can understand the flow of the execution. The for loop is an infinite loop, when we press an interrupt key (Ctrl+C), the execution will stop.

Generating SIGALRM using signal() function cannot be stacked. Only one SIGALRM generation can be scheduled. Successive calls of signal() function reset the alarm clock of the calling process.

Example2.c :

#include
#include
#include

void sig_handler ( int signum ) <

printf ( «Inside handler function \n » ) ;
>

signal ( SIGALRM , sig_handler ) ; // Register signal handler

alarm ( 4 ) ; // Scheduled alarm after 4 seconds
alarm ( 1 ) ; // Scheduled alarm after 1 seconds

for ( int i = 1 ;; i ++ ) <

printf ( «%d : Inside main function \n » , i ) ;
sleep ( 1 ) ; // Delay for 1 second
>

In the screenshot of the output of Example2.c, we can see that the program executed more than 7 seconds but the first alarm which was scheduled after 4 second is not calling the handler function. The second alarm which was scheduled after 1 second is reset the alarm.

If the value of the argument seconds is zero, then any previously made alarm request is cancelled.

Example3.c:

#include
#include
#include

void sig_handler ( int signum ) <

printf ( «Inside handler function \n » ) ;
>

signal ( SIGALRM , sig_handler ) ; // Register signal handler

alarm ( 2 ) ; // Scheduled alarm after 2 seconds
alarm ( 0 ) ; // Cancelled the previous alarm

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for ( int i = 1 ;; i ++ ) <

printf ( «%d : Inside main function \n » , i ) ;
sleep ( 1 ) ; // Delay for 1 second
>

In the screenshot of the output of Example3.c, we can see that the first alarm which was scheduled after 2 seconds is cancelled because of the second alarm for 0 second.

In Example4.c we will see how continuously we can set an alarm for every 2 seconds.

Example4.c:

#include
#include
#include

void sig_handler ( int signum ) <

printf ( «Inside handler function \n » ) ;

alarm ( 2 ) ; // Schedule a new alarm after 2 seconds
>

signal ( SIGALRM , sig_handler ) ; // Register signal handler

alarm ( 2 ) ; // Schedule the first alarm after 2 seconds

for ( int i = 1 ;; i ++ ) <

printf ( «%d : Inside main function \n » , i ) ;
pause ( ) ; // waiting until signal is handled
>

In the screenshot of the output of Example4.c, we can see that the alarm is continuous in every 2 seconds. We reset the alarm in the sig_handler function.

In Example5.c we will see how we can delay the alarm already scheduled. We will use SIGINT signal for interrupt. When user type Ctrl+C in keyboard, SIGINT signal will generate.

Example5.c:

#include
#include
#include

void sig_handler ( int signum ) <

printf ( «Inside handler function for SIGALRM \n » ) ;
alarm ( 2 ) ;
>
if ( signum == SIGINT ) < // signal handler for SIGINT
printf ( » \n Snoozing for 5 seconds. \n » ) ;
alarm ( 5 ) ;
>

signal ( SIGALRM , sig_handler ) ; // Register signal handler for SIGALRM
signal ( SIGINT , sig_handler ) ; // Register signal handler for SIGINT

alarm ( 2 ) ; // Schedule the first alarm after 2 seconds

for ( int i = 1 ;; i ++ ) <

printf ( «%d : Inside main function \n » , i ) ;
pause ( ) ; // waiting until signal is handled
>

In the screenshot of the output of Example5.c, we can see that when user type Ctrl+C the alarm is reset 5 seconds. In this program we have used only one handler function for two different signals but in the handler function it has been checked that for which signal the handler function is being called.

Conclusion:

So, we have seen that how alarm function can be set for triggering signal, how to reset alarm, how to cancelled already scheduled alarm.

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